title: C++ 获取系统目录，自身目录，临时目录，文件读写
author: Love02xp
date: 2020-08-09 13:04:17
category: [编程代码]
tags: [VC6,代码,学习]

C++ 获取系统目录，自身目录，临时目录，文件读写

@TOC

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正文

include "stdafx.h"

include <stdlib.h>

include <stdio.h>

include <iostream.h>

include <windows.h>

include <memory.h>

include <string.h>

int WriteFile();

int main(int argc, char* argv[])
{

//获取系统temp目录
char    strTmpPath[MAX_PATH];
GetTempPath(sizeof(strTmpPath), strTmpPath);
printf("获取系统temp目录：%s\n",strTmpPath);

// 获取自身的绝对路径
char    strSelf[MAX_PATH];
memset(strSelf, 0, sizeof(strSelf));
GetModuleFileName(NULL, strSelf, sizeof(strSelf));
printf("获取自身的绝对路径：%s\n", strSelf);

//获取当前进程号
printf("获取当前进程号：%d\n",GetCurrentThreadId());

// 获取系统目录
char strSysDir[100];
GetSystemDirectory(strSysDir, sizeof(strSysDir));
// char *bin = "%SystemRoot%\\System32\\svchost.exe -k netsvcs";
printf("系统目录：%s\n",strSysDir);

//采用：CreateFile、ReadFile、WriteFile读写文件
WriteFile();
//采用fread、fwrite
system("pause");
return 0;

}

int WriteFile()
{

DWORD dwFileSize = 0;

BYTE* buffer = NULL;

HANDLE hFile = INVALID_HANDLE_VALUE;

hFile = CreateFile("E:\\123.txt",GENERIC_READ,
                   FILE_SHARE_READ,NULL,OPEN_EXISTING,
                   FILE_ATTRIBUTE_NORMAL,NULL);

if (hFile == INVALID_HANDLE_VALUE)
{
    CloseHandle(hFile);

    printf("Create File Failed !\n");
    return 0;
} 
else
{
    dwFileSize = GetFileSize(hFile,NULL);
    //LARGE_INTEGER lFileSize;
    //GetFileSizeEx(hFile,&lFileSize);//若文件长度超过0xFFFFFFFF，使用GetFileSizeEx。
    printf("%d\n",dwFileSize);

    buffer = new BYTE[dwFileSize];
    if (buffer == NULL)
    {
        printf("Create buffer error !\n");
        return 0;
    }
    ZeroMemory(buffer,dwFileSize);

    DWORD dwReadSize = 0,dwReadTotal = 0;

    while (dwReadTotal < dwFileSize)
    {
        ReadFile(hFile,buffer + dwReadTotal,dwFileSize - dwReadSize,&dwReadSize,NULL);
        dwReadTotal += dwReadSize;
    }
    printf("总共读取的文件大小:%d\n:",dwReadTotal);
}

hFile = CreateFile("E:\\方式一.txt",GENERIC_WRITE,0,NULL,               
    CREATE_ALWAYS,FILE_ATTRIBUTE_NORMAL,NULL);
if (hFile == INVALID_HANDLE_VALUE)
{
    CloseHandle(hFile);
    printf("Create File Failed -2 !\n");
    delete []buffer;
    buffer = NULL;
    return 0;
} 
else
{
    DWORD dwWriteTotal = 0,dwWriteSize = 0;
    while (dwWriteTotal < dwFileSize)
    {
        WriteFile(hFile,buffer + dwWriteTotal,dwFileSize,&dwWriteSize,NULL);
        dwWriteTotal += dwWriteSize;
    }
}
delete []buffer;
buffer = NULL;
CloseHandle(hFile);

}
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